diff --git a/stepmania/configure.ac b/stepmania/configure.ac
index 3fdc7d6333..0181c824cd 100644
--- a/stepmania/configure.ac
+++ b/stepmania/configure.ac
@@ -203,7 +203,7 @@ AC_CHECK_DECL(cosf, , AC_DEFINE([NEED_TANF],1,[Need cosf]), [#include <math.h>])
 AC_CHECK_DECL(acosf, , AC_DEFINE([NEED_ACOSF],1,[Need acosf]), [#include <math.h>])
 AC_CHECK_DECL(roundf, , AC_DEFINE([NEED_ROUNDF],1,[Need roundf]), [#include <math.h>])
 AC_CHECK_DECL(truncf, , AC_DEFINE([NEED_TRUNCF],1,[Need truncf]), [#include <math.h>])
-AC_CHECK_DECL(strtof, , AC_DEFINE([NEED_STRTOF],1,[Need strtof]), [#include <stdlib.h])
+AC_CHECK_DECL(strtof, , AC_DEFINE([NEED_STRTOF],1,[Need strtof]), [#include <stdlib.h>])
 
 # This doesn't work on glibc math functions:
 # AC_CHECK_FUNCS([sqrtf sinf tanf cosf acosf roundf truncf])